package sample; import sample.SerialPortService; import javafx.application.Application; import javafx.geometry.Insets; import javafx.scene.Scene; import javafx.scene.control.Slider; import javafx.scene.layout.BorderPane; import javafx.stage.Stage; public class Main extends Application { public static void main(String[] args) { launch(args); } @Override public void start(Stage primaryStage) { var sp = SerialPortService.getSerialPort("/dev/cu.SLAB_USBtoUART"); var outputStream = sp.getOutputStream(); var pane = new BorderPane(); var slider = new Slider(); slider.setMin(0.0); slider.setMax(100.0);  // TODO: Add a 'listener' to the {@code valueProperty} of the slider. The listener // should write the {@code byteValue()} of the new slider value to the output stream.  pane.setCenter(slider); pane.setPadding(new Insets(0, 20, 0, 20)); var scene = new Scene(pane, 400, 200); primaryStage.setScene(scene); primaryStage.show(); } }